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A form of rust inhibitor is adding a liquid to a compound to help prevent rusting in the metal structures through which the liquid flows. This type of inhibitor creates a thin protective film that prevents reactions from occurring between the metal structures, such as pipes and the compounds.

Commonly, rust inhibitors are coated on the material being protected, such as a metal or alloy. They help create a protective thin layer over the metal or alloy to protect it against rusting. For example, oil is an effective rust inhibitor, as it prevents oxidation.